As sometimes happens, I found myself the answer after a few minutes. Using the following solves the problem:

use Win32::OLE 'CP_UTF8';
$Win32::OLE::CP = CP_UTF8;

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In reply to Re: Win32::OLE SAPI.SpVoice Japanese by Takamoto
in thread Win32::OLE SAPI.SpVoice Japanese by Takamoto

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